Mk 19s specs
Don't know about the length and weight, I just know it's too heavy for anything except for using on a gun-truck.
The min arming distance is 17 meters, but in all practicallity, it's more like 25. I saw an ND into hesco barrier 22 meters away and it didn't blow. It works off of a centrifugal fuse that requires 3 rotations, I think. DP is 2" of steel, and DP is about all the ammo you get anyway, unless they make orange death for it. I know they make orange death for 203's, I'm not sure about 19's.
The only package I've seen rounds come in is an ammo can with 36 rounds, but in invasion of fallujah everyone rigged a can on the side of the turret so they could have two cans linked together (linking grenades is a pain in the butt).
Very fun weapon. Nothing says "I hate you and hope you die" quite like a GMG, though the ma duece with APITS come close. Excellent for indirect fire, but I wouldn't call in the same format as other supporting arms. You still need an FO with some good sense, most gunners I know of aren't exactly squad leaders or platoon seargents. Point being they probably aren't familiar with how an FDC works. If the gunner can't get eyes on, the FO needs to know the gunners pos so they can relay correction in relation to the gunners pos and not the FO's.
Alright, good 'nough for now.